CVE-2026-3783
token leak with redirect and netrc
Description
When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:LConfidentialityLow
I:NIntegrityNone
A:NAvailabilityNone
Weaknesses
Affected Products
curl
oss-project·USaka libcurl, wcurl
haxx
oss-project·SEaka haxx.se
ООО «Ред Софт»
commercial·RUaka red soft
АО «ИВК»
commercial·RUaka ivk
Daniel Stenberg
individual-devaka daniel.haxx.se, daniel stenberg (curl author)
Exploitability
Official Patch Available
Attack Graph
Products CVE Techniques Tactics
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MITRE ATT&CK
2 techniques Credential Access
References
https://curl.se/docs/CVE-2026-3783.json
curl.se
https://curl.se/docs/CVE-2026-3783.html
curl.se
https://hackerone.com/reports/3583983
hackerone.com
and 5 more references View all →
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